metamorphic
Copper-bearing schist (likely bornite/chalcopyrite ore)
Micaceous schist with sulfide minerals, chiefly bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂)
AI-generated identification · may be incorrectCoarse, foliated texture with reflective mica, brassy metallic sulfides, and pinkish copper-oxide staining; likely Mohs 3–4 overall, with sulfides around 3–4, moderate-to-high specific gravity, and no consistent cleavage in the massive ore.…
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Physical properties
Coarse, foliated texture with reflective mica, brassy metallic sulfides, and pinkish copper-oxide staining; likely Mohs 3–4 overall, with sulfides around 3–4, moderate-to-high specific gravity, and no consistent cleavage in the massive ore. The iridescent tarnish is typical of “peacock ore,” though this may be natural rather than artificially treated.
Formation & geological history
Formed when copper-bearing sulfide minerals crystallized in hydrothermal veins or metamorphosed volcanic rocks, with later weathering producing colorful oxidation; age depends on locality and cannot be determined from the image.
Uses & applications
Potential copper ore if sulfide content is high; otherwise used as a collector specimen. Attractive pieces may be sold as decorative “peacock ore,” but it is generally unsuitable for jewelry because it is soft and tarnishes.
Geological facts
Bornite is commonly called peacock ore because oxidation creates purple, blue, green, bronze, and pink colors. The surface appears dominated by mica and sulfide-rich patches rather than a single crystal mineral.
Field identification & locations
Look for metallic brassy grains, colorful tarnish, heavy feel, and flaky foliation; a streak, hardness, density, and chemical test are needed for confirmation. Common in copper deposits worldwide, including hydrothermal veins and metamorphosed massive-sulfide districts.
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